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<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>数组扁平化测试</title>
  <script src="../../src/array/flatten.js"></script>
</head>
<body>
  <script>
    let arr = [1,2,[3,4,[5,6]],7];
    console.log(flatten1(arr))
    console.log(flatten2(arr))
  </script>
</body>
</html>